rock-shaft

rock·shaft

[rok-shaft, -shahft]
noun Machinery.
an oscillating shaft.

Origin:
1870–75; rock2 + shaft

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
rockshaft (ˈrɒkˌʃɑːft) [Click for IPA pronunciation guide]
 
n
a shaft that rotates backwards and forwards rather than continuously, esp one used in the valve gear of a steam engine

Collins English Dictionary - Complete & Unabridged 10th Edition
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Rock-shaft is always a great word to know.
So is lollapalooza. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a chattering or flighty, light-headed person.
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